Shapeless: The pinky model in that video looks pretty good. Man, I can remember when I used to think using a chunk of corrugated cardboard for my figures bases was a good choice too.

I'm rather partial to the Marine toy with the huge helmet/accessories--while it's kind of cheesy, I think that's the kind of DOOM figure you probably would have seen in the 90s if somebody has gotten the license. The Revenant is cool too, but I can't for the life of me figure out why the artist didn't use transparent arms to match the legs.

Those are pretty cool, the only criticism I have is that the animal teeth elements you added don't match up well with the bone color of the Ghost Rider heads. A black or gray paint wash on them would probably give you a more consistant overall look (or, alternatively, you could paint the skulls to match the teeth, but that'd be more work). It's obvious that they're added on elements as-is, particularly on the larger of the two heads.

The color match of the bigger Lost Soul is very close in person but the photo catches them differently. I own a lousy camera to start with. The smaller one was painted over. The toy skull had a nasty black paint wash so it was necessary.